FieldsConstruction and building materials
Experiments here usually have about 3 factors and 10 runs. Response surface designs and full factorials are the most common. The catalog holds only a few from this field so far.
- Full factorial
- Fractional factorial or screening
- Central composite or Box-Behnken
- Other designs
Show the numbers
| Kind of design | Experiments | Factors | Runs |
|---|---|---|---|
| Full factorial | 1 | 2 | 9 |
| Fractional factorial or screening | 1 | 3 | 4 |
| Central composite or Box-Behnken | 2 | 3 | 27.5 |
| Other designs | 1 | 5 | 18 |
Factors and runs are the medians of each kind.
Full factorial
Every combination of the factor levels.
Fractional factorial or screening
A planned part of the combinations, to find the factors that matter.
Central composite or Box-Behnken
Extra runs that fit curvature, to find an optimum.
- Fired absorption of whiteware against three raw-material ratios and the firing temperature (Exercise 11.18)Box and Draper (2007) · 4 factors, 45 runs
- Operating efficiency of cement-block manufacture against travel and vibration (Problem 32 of Part IV)Box, Hunter and Hunter (1978) · 2 factors, 10 runs
Other designs
Optimal, blocked, split-plot and other designs made for the problem.